Stefanie Teufel wrote: Hmm. Well, the problem is definitely specific to b40. The behaviour of the `concat' function was changed in b40. It no longer accepts integers as arguments, hence the Wrong type argument: sequencep, 2 error. The patch to start-itimer is definitely necessary. However, the change may well have broken other things. Try setting debug-on-error to t. That should give you a backtrace which indicates which function the error is in. -- Glynn Clements <glynn(a)sensei.co.uk&gt;