I love plesk panel I've been using it for 10 years. But the updates are really messy. it is very tiring to do a zero install on major updates and re-install 50 web sites. hope these problems will improve over time
We often have problems with Plesk transition updates.
i have the same problems as Mark@beeldr.
OS : Cent OS 6.8 (64 Bit)
80% of extensions do not work with update
example
(D)DOS Deflate Interface (Plesk)
Linux Malware Detect Manager (Plesk)