I don't know whether to be relieved or horrified...We have a cause but I now have to test the hundreds of missions to which I'm subscribed separately.

Can confirm also; no idea yet which mission caused it but unsubscribed to all workshop items and back in business.

Default profile also working with no workshop missions present.

I have.

Not sure if it was default but certainly reasonably old.

Uploaded ...it's big though (.zip not .rar I'm afraid.

They are just in My Documents/ARMA3 not a separate profile folder.

In the location you initially suggested I have only MPMissionsCache, SteamMissionsCache, SteamPreviewCache, and the rpt files.

https://www.youtube.com/watch?v=i-0eObJIhZw

New profile helps. Stutter still present at the same interval but load screen has gone -vastly improved(playable but still enough to be somewhat frustrating).

Uploading video of the original issue to youtube atm, will post link when it's done.

Apparently it has some effect at the client side too, described by my client as:

" it's like connection has been lost or lag - physics seems to keep going for a few seconds, then everything "skips" back to it's actual server position. This means vehicles and other physx objects literally float off the ground then pop back down again, while infantry just seem to skip back in time. No indication that connection is suffering (no link icon or messages)."

Problem occurs immediately.

Both LAN and Internet hosting.

Tried with 0 clients and 1 client occurs with both.

Verified not occurring in single-player missions.

I completely removed my ARMA 3 install and reinstalled fresh last night (It had been installed since alpha) file verification all ok.

If any further information/tests would be useful I'm willing to try.

Still occurring in Dev-Branch too.

Uploaded further data as requested.

Same issue, uploading rpt file. As an aside, this was happening on devbranch, moved back to vanilla and all was ok, now doing it on vanilla too.