Caching occurring, even though Web Accel profile was removed from VS?

Env: LTM 11.5.2 plain, no hotfixes

Hmm. We have a virtual server that, when originally setup, had a optimized_caching web acceleration profile associated with it. But in early testing (over a year ago), the caching was noted to cause problems, so I removed the web acceleration profile from the VS config.

However, now, over a year later, the app team has rolled out a new version on their app servers - and pieces/parts of that application are acting as if the old version is in place.

The original (no longer used) web acceleration profile still exists - but when I listed ramcache objects on it, there are none. Nevertheless, just for grins, I deleted it ... and the app started working better. Not 100% ... but clearly better.

Is there any record of a defect that would relate to this? I.e., a web acceleration profile that was removed from a VS still impacting that VS? Or, alternatively, can anyone think of any other explanation of how deleting the vestigial profile could have any impact?

Truth in lending disclosure here -- the app is still not 100%. It improved markedly, but there are still issues.

Thoughts?