I have changed our global signature from a temporary signature back to
our standard signature. After that I found out that my client is still
using the old global signature: but only if running in caching mode. In
online mode the "new" signature is used.

How can I convince my client to use the correct signature?

Server is OES2 SP0 with GW 8.0HP2. Client is GW8.1 (Windows)

Thanks in advance.