It seems to be quite stable...
I found a problem while using the tractor beam. If I shot down a "mission enemy" which would normally be friendly (Captain Seelig in Pentonville, a Roman Lynch Mission; or the Maniac Garrovick in the Mission of the ES Taryn Cross in Rygannon), there might be the pilot or cargo floating around. If I try to tractor this blue marked pilot or cargo from this destroyed ship the game always stops / hangs with an error message.
I got several hangs while trying the tractor beam of the rear turret on a centurion. The sound of the beam starts, the pilot or cargo is moved and short before the "clack" of the shutting cargo doors should be played the game hangs.
Pressing "ESC" will close the whole game.
Using the task manager, the message "Vegastrike space simulator does not work properly anymore ... The program will be closed and you will be noticed if a solution is found." or something like this (is shown in german on my computer) is displayed in a separate small window.
No Error files are written in this case.
An other problem I found is the radar. If you jump in a system, select a nav point outside the normal radar range, the nav point will not be shown in the radar any longer. Before selecting it is shown as a grey dot (normal nav point) or light blue (a jumppoint), but after selecting it is gone. If you can use the autopilot it works fine, but if you want to flee (for example because you don't want to shot the militia while running a contraband cargo) you will have to make some circles to find the white cross in your window, marking the nav point, to know the dicrection you will have to fly to.
And the colors of the radar are different to the normal 1.03 version. For example missiles are shown as grey dot. I think this could be done by modifying the vegastrike.config (I will have to check this later).