Friends vanish suddenly, do not re-appear unless I relog or DM them

[Thoth Mason]

Firestorm Viewer 6.6.8.68380 (most recent version, happened on prior version too) Windows 10

Suddenly, and without warning, all of my logged-in friends will vanish and show as "offline".  This happens in bulk.  The SL web site shows them as online, so this is a server/viewer issue.  It doesn't matter if they're on the same region/sim or not.

If I receive a DM from them (or send one) that one person will now appear as logged in -- I'll get the "user x is online" message as though they'd logged in.  Monetary transactions will bring that person back too.  To get them all back, I need to log out and log back in again.

This has been going on for about a month.  I have removed/reinstalled Firestorm.  There's no other software running, really.

Suggestions?

[Rowan Amore]

10 minutes ago, Thoth Mason said:

Firestorm Viewer 6.6.8.68380 (most recent version, happened on prior version too) Windows 10

Suddenly, and without warning, all of my logged-in friends will vanish and show as "offline".  This happens in bulk.  The SL web site shows them as online, so this is a server/viewer issue.  It doesn't matter if they're on the same region/sim or not.

If I receive a DM from them (or send one) that one person will now appear as logged in -- I'll get the "user x is online" message as though they'd logged in.  Monetary transactions will bring that person back too.  To get them all back, I need to log out and log back in again.

This has been going on for about a month.  I have removed/reinstalled Firestorm.  There's no other software running, really.

Suggestions?

LL and Firestorm are aware of the problem.  From the Firestorm website regarding their newest viewer...

Online Status: Linden Lab has produced a partial fix for the problem of friends’ online status not showing correctly. This is a viewer-side fix that Firestorm has now inherited from LL code. There is still a server-side problem to be addressed, but we are hopeful that this viewer-side fix will be a noticeable improvement.