Running the newest version of the alpha (v1.4.0 alpha5) is actually stable. Seems to be running fine on my machine now. Would you recommend continuing to run the alpha? I've got 10 of these babies and a 7950 hashing away.
EDIT: Though, I am getting errors such as:
2013.06.14 [03:19] Icarus (COM36) ERROR: Icarus (COM36) ran out of work. Idling...
Hmm, is the status line at the bottom showing zero queued work at the time? (grey boxes)
Yes, sometimes the work gets very low (I usually get more work when it gets down to the 50s though), and since I have 11 devices all on this one worker, I sometimes don't get enough new work queued up fast enough.
EDIT: Other type of error I get:
2013.06.14 [03:56] Icarus (COM34): Not getting any results. Retuning timers.
2013.06.14 [03:56] Icarus (COM34): Command response 10 ms, hash rate 335.8 Mhps.
Also, the software sometimes shows wildly inaccurate hashrates, such as a USB erupter at 2000 MH/s.