packp3d error

I’ve used packp3d successfully before, but recently, whenever I try to use packp3d (or any other p3d file), I get a popup message box saying “The application was unable to start correctly (0xc0000005). Click OK to close the application.” No other information appears.

I tried reinstalling the sdk and the runtime, but nothing helped. I’m using panda version 1.8.1 and runtime version 1.0.4 on Windows 7 64bit.

I attached a picture of the error and message box.

Any ideas on how to get this working?