After DEEP further investigation, and TRIPLE single file checking (both on IH3 and ZLB), I've found another major problem, which might be the cause (hope so) of all other problems... or at least a further indication of where the real problem is...

I've tried to clean my bmz_cache folder many times, but there are some folders which are NEVER deleted.
They are folders named

/bmz_cache/0
/bmz_cache/1
/bmz_cache/4
/bmz_cache/5
/bmz_cache/6
/bmz_cache/7
/bmz_cache/f

no matter if there are 100 images inside or just a couple (after a recent MANUAL cleaning...).

After MANY trials MANUALLY DELETING anything, browsing some items, and cleaning again the bmz_cache, only the above (if created in the meanwhile) are NEVER deleted...



Might this behaviour tell me (you) some more ???

To be more precise:
Web: www.4shops.it (even if I doubt you might see the problem from your side...)
PHP Version: 5.2.10 (Zend: 2.2.0)
PHP Safe Mode: OFF
Database: MySQL 5.0.95
REmaining data is on my signature...