I am having this exact same issue (and have been for a while). Works fine in SP, every multiplayer server I join, as soon as I hit the SA page the entire game freezes. I have tried a full reinstall of DCS and same issue.
GTX 1080 latest drivers, intel i9 system 32 GB of ram, Win 10
Let me know if you want to see any additional logs - something I noticed in my DxDiag tool:
Windows Error Reporting:
+++ WER0 +++:
Fault bucket , type 0
Event Name: AppHangB1
Response: Not available
Cab Id: 0
Problem signature:
P1: DCS.exe
P2: 2.5.5.35461
P3: 5d6eb7db
P4: 25f0
P5: 134217728
P6:
P7:
P8:
P9:
P10:
+++ WER1 +++:
Fault bucket , type 0
Event Name: APPCRASH
Response: Not available
Cab Id: 0
Problem signature:
P1: DCS.exe
P2: 2.5.5.35461
P3: 5d6eb7db
P4: CockpitBase.dll
P5: 2.5.5.35461
P6: 5d6d80b7
P7: c0000005
P8: 000000000015a965
P9:
P10:
+++ WER2 +++:
Fault bucket , type 0
Event Name: AppHangB1
Response: Not available
Cab Id: 0
Problem signature:
P1: DCS.exe
P2: 2.5.5.35461
P3: 5d6eb7db
P4: 25f0
P5: 134217728
P6:
P7:
P8:
P9:
P10:
+++ WER3 +++:
Fault bucket , type 0
Event Name: APPCRASH
Response: Not available
Cab Id: 0
Problem signature:
P1: DCS.exe
P2: 2.5.5.35461
P3: 5d6eb7db
P4: CockpitBase.dll
P5: 2.5.5.35461
P6: 5d6d80b7
P7: c0000005
P8: 000000000015a965
P9:
P10:
+++ WER4 +++:
Fault bucket , type 0
Event Name: APPCRASH
Response: Not available
Cab Id: 0
Problem signature:
P1: DCS.exe
P2: 2.5.5.35461
P3: 5d6eb7db
P4: CockpitBase.dll
P5: 2.5.5.35461
P6: 5d6d80b7
P7: c0000005
P8: 000000000015a965
P9:
P10: