Multisite domain mapping breaks CSS

This is an old question, but I just ran into this same issue and found the problem: the MU Domain Mapping plugin is using a deprecated constant, PLUGINDIR, to remap the plugin directories on the mapped domains.

The plugin seems to be very vaguely developed nowadays (and no releases have been out for a year), so I just edited my copy of the plugin directly. In domain_mapping.php for the domain_mapping_plugins_uri() function (around line 650), short-circuit that function by just returning $full_url without running through its other routines.

This should fix the problem.

Related Posts:

  1. How to use WordPress Multisite With Different Domain Names?
  2. Can a multisite’s blogs be accessible from two different sub-domains?
  3. Domain mapping (without plugin) in 4.5.x multisite?
  4. Multisite Domain Mapping with SSL
  5. Customizing wp-activate.php
  6. How to set up wordpress domain mapping on MAMP Pro
  7. How to use alias domain for multisite installation?
  8. WordPress Multisite with multiple domains using Nginx
  9. Steps for Moving Multiple WordPress Installs to a Multisite Install?
  10. sunrise.php for multi-network install of domain mapping plugin
  11. Infinite loop problem with the WordPress MU Domain Mapping plug-in
  12. Is it still only possible to do multisite domain mapping with a plugin in WordPress 4.1?
  13. How to manage multiple domain with different languages on each domain with single wordpress installation?
  14. “Preview Changes” button doesn’t show changes for previously published posts/pages
  15. Multisite configuration fails with css/js files
  16. How to add new sites and map a custom domain in WordPress Multisite?
  17. WordPress multisite with different domain
  18. Child Theme CSS Not Overriding Parent Theme In MultiSite Site
  19. Trying to migrate a WordPress Multisite with Domain Mapping
  20. Multiple blogs, different domain names, one install to rule them all
  21. Hide root site in Multisite install
  22. How do I add JavaScript that will execute on all my sites in Multisite?
  23. Subfolder multisite issue. Themes and plugin files 404
  24. How do I use different domain for subdomains in WP Multisite?
  25. subdomain mulitsite on localhost in a subfolder
  26. WordPress Network for regional company websites
  27. How to do Domain Mapping to Subdirectories?
  28. Creating Admin Options Page where users can make changes to a theme
  29. Possible to create a multisite network where the main site is non-WP?
  30. How do I park secure.primary.com on top of the multisite ID:1 domain: www.primary.com (primary multisite domain)
  31. Multiple domains with different child themes on one installation?
  32. Changing admin sub-domain in WordPress multisite
  33. WordPress multisite with multiple parent domains
  34. WP 4.4 – domain mapping for sites within a multisite network?
  35. How to Redirect login User with Mapped Domiain Primary blog Url to Original Sub-site Url
  36. WP MU – Accessing ‘Domain-Mapped’ WP-Admin with a subdomain
  37. Child Site doesn’t appear in the Network menu
  38. Create rewriterules for different domains in htaccess file with WP multisite
  39. Multisite domain naming
  40. WordPress MU Domain Mapping Just Redirects to Main Site
  41. WordPress Multisite domain mapping with different IPs
  42. WordPress Multisite with Addon Domains (not parked domain) [closed]
  43. Mapping domains to WordPress network installed on subdomain
  44. WordPress 4.5+ Multisite Domain Mapping
  45. Link structure, WordPress IIS
  46. Multisite – Parent site with Polylang with different domains for each language [closed]
  47. Viewing / Editing A Multisite website after domain has expired
  48. WordPress Multisite + Erros with URLS and ADMIN
  49. Login problems on multisite installation with different domains
  50. Is this a job for WP MultiSite with domain mapping plugin?
  51. MU/Subdomains + Domain Mapping + SSL?
  52. network site domain mapping still applied after being removed
  53. How to set up wordpress domain mapping on MAMP Pro
  54. Domain Mapping for WordPress MU and https redirection – How to?
  55. Canonical Resource URLs Across a Multisite Network 2012?
  56. How to Deny Access to No Referrer Requests on Multiste with Mapped domains
  57. Multisite – One Site with multiple URLs
  58. Sub-sub folders of WordPress Multisite subdirectory
  59. Create a CSS file in plugin folder when theme is activated
  60. Different Domains in Multisite Setup
  61. How to use the sunrise.php script for Multisite network domain mapping?
  62. Multisite on single wordpress
  63. WordPress Multisite with subdomains on different domains
  64. Check if current site ID and value exist in WPDB
  65. Domain Mapping subsites of an Add-on Mulsite Domain
  66. Change WordPress Multisite Domain
  67. Forward and mask a WordPress website
  68. How to Force WWW. in Domain With WordPress MU Domain Mapping Plugin?
  69. wordpress multisite domain mapping redirects to original subdomain
  70. WordPress Multisite and how to apply sef urls only to specific sites
  71. Custom css – WordPress Multisite
  72. multisite installed on subdomain now want another subsite on subdirectory
  73. Migrating from domain mapping plugin to native domain mapping
  74. How to map domains to specific pages in WordPress and display them in the address bar?
  75. WordPress Multisite – Domain Mapping
  76. WordPress Multisite with Wildcard Certificates not mapping correctly
  77. Login issues on WordPress Multisite and domain mapping
  78. SSL for Mapped Domains with WordPress Multisite on AWS
  79. Multisite domain mapping with SSL redirects to main domain
  80. Multisite htaccess with domain rewrites
  81. WordPress Multi site Map Domains
  82. new WPMS site not working / Q setting up new site/subdomain
  83. Multisite with different domain names
  84. Optimal setup for Multi Domain WordPress with Woocommerce
  85. How to implement this subdirectory mapping in multisite?
  86. MU domain mapping without using a plugin
  87. Domain mapping breaks some plugin scripts and css
  88. How to configure WordPress for multiple blogs without using multisite?
  89. Site w/ Addon Domain doesn’t show CSS
  90. Subdirectory and domain multisite installation
  91. Multisite: Run a subdomain install from a directory install
  92. WordPress Domain Mapping shows new domain in place but takes me to the sub domain
  93. MU Domain mapping
  94. Multisite redirect loop for a single www domain
  95. Some Subdomains on a Multisite Install Not Found
  96. Best Way to Setup a Network of WP Sites?
  97. Cookies in Multisite network where sites have their own domain name?
  98. Map WP Multisite blog.example.com to anotherdomain.com/blog?
  99. Multisite with Static home page mixed with separate domain name
  100. Have two domains point to the same content on a wordpress multisite