2017 Service pack 4.1 corrupting files !!

Hi all,

Just started to use 2017 sp4.1 and its corrupted two files already, that have been fine since 2004!

Said the files were corrupted and I could try to save as a different file, with I tried and then this file encountered a serious problem when I tried to open it.

Restarted Solidworks and now things seem fine again........

Could be a one off, but I have never seen this before!

The old solidworks session was less than 3 hours long.

Pete

SolidworksAssemblies