From Ronald Aigner:
Now that really sounds strange. You say that the task is running as L4Env task? No L4Linux involved? Not even on the sender/receiver side of the IPC?
In that case, L4Linux is not even started. Client and server side are pure L4env tasks. More strange : other IPC even from the same tasks work. It seems that there is a bug only for that entry.
I'd go with revision 233 from public repository.
r238 seems to work well for current point. But I didn't do any test on hybrid L4Linux tasks yet.
Regards Marc