Hello all,

After installing TIA V16+Wincc, the step 7 v5.6 sp1 stopped working. Had missing symbol.dll and error 2517:5, etc, etc. I decided to upgrade to Step 7 v5.6 sp2 but no luck, then installed v5.7 and hotfix and the only problem I have is the FBs are being displayed empty without error message. SCL, DBs and symbols are working fine. Also when an FB is opened (empty) clicking on the insert or options tab closes immediately the window.

Attached is the Siemens programs currently installed in my PC. 

Any help is greatly appreciated.