I write this somewhat sheepishly since I love this plugin. W3 Total Cache is a remarkable piece of work and has been a true lifesaver for my site.
The problem I have been having is with cron jobs getting stuck in the queue. I noticed three plugin cron jobs getting stuck in particular.
- WordTwit Pro: scheduled tweets fail
- GDPress Tools Pro: scheduled backups fail
- Disquus Commenting System: scheduled comment sync fails
I did some troubleshooting and narrowed down the issue as W3 Total Cache's database and object caching features. When I disabled the database and object caching features, the cron job queue returned to normal operation.
I am not sure what about my server environment, these plugins and W3 Total Cache's database and object caching is conflicting, but I have Xcache enabled as the Opcode caching method. I have yet to try APC or Memcache to determine if I can replicate the errors under those conditions. For now, I have disabled database and object caching.
Even so, in my book, this is still the best WordPress caching plugin out there - and it's free! I would appreciate any advice as to how to resolve this one issue.