[Glass] FindFreeFrame: potential infinite loop

[pieter at nagel.co.za]

A Topaz session on a staging server just suffered the following error:

potential infinite loop at 07/16/2014 07:49:17 SAST
FindFreeFrame: found free page and exited loop at 07/16/2014 07:50:21 SAST
(64 seconds)
FindFreeFrame: potential infinite loop at 07/16/2014 07:50:31 SAST
FindFreeFrame: found free page and exited loop at 07/16/2014 07:52:36 SAST
(125 seconds)
FindFreeFrame: potential infinite loop at 07/16/2014 07:52:46 SAST
FindFreeFrame: found free page and exited loop at 07/16/2014 08:09:40 SAST
(1014 seconds)

[Info]: Logging out at 07/16/2014 08:09:45 SAST
-----------------------------------------------------
GemStone: Error         Fatal
Your GemStone session has been forcibly terminated, , stone shutting
down
Error Category: 231169 [GemStone] Number: 4059  Arg Count: 1 Context : 20
exception : 20
Arg 1: 20

The symbol gem, and all our other logged in gems also logged about
"FindFreeFrame: potential infinite loop" at the same time.

Any advice on hunting this down?