Problems with my caller ID. Help please

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Ok I have Slide 2 Unlock 2 installed on my phone and when it is activated and I get an incoming call the call ID works fine, it is when Slide 2 Unlock is not activated, the phone will ring but nothing pops up telling me who is calling, I can click on the green phone button on the bottom right of the phone and then click talk to answer, but even there it does not show who is talking. I am running the new Windows Mobile 6.1, but this was doing this even with the previous ROM. Has anyone else experienced this problem? Is there just some setting that I need to set? Thanks