cache is fully writable - nodes are created with links to files in the correct cache directory, but no files are being saved in the cache - consequently nothing is displayed on the webpage other than the background colour.

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raylewis’s picture

raylewis CreditAttribution: raylewis commented

Further investigation shows that the problem exists when clean url is not enabled. Providing clean url is enabled then the cache is written correctly and the thumbnail images show as they should. Note that to recover the site from the corrupt situation it was essential to delete all caches, and to clear data from the brilliant gallery tables in the database, including the entry in the cache table. Clearly to avoid the fatal issue the code should be modified so that it is fully compatible with the core, whether or not clean url is enabled.