I had some bad problems with MP4 update :
- blackscreens during mapchange in servers
- chrashes when I opened a map in editor
I saw posts here with same problems - and all logfiles I read, show problems with AMD-grafic. (a conflict in 32/64-structure ?)
I had the latest AMD-certified drivers and Catalyst installed - and deleted all AMD-grafic-files via WIN10 device-manager
- WIN+R / write "devmgmt.msc" (without " ) Enter
- select "graficcard" / drivers / DEINSTALL / Enter
then I rebooted my PC - and Windows selected the best driver for me

now I use AMD-driver from 2017 (vers. 22.19.677.257)
and IT WORKS FINE - no more problems - no crashes !
Sorry for my rotten english - but maybe that helps others too...