We were never able to permanently resolve the issue with the version of Guided Reporting we were using at the time. We just had to click though it an eventually you got to a GR home screen that had all of your defaults sans the missing cube view (column set). We then had the user choose one and run a report. Because of the "sticky default" nature of GR, that solved the problem.
We haven't seen this behavior (yet) with the PV600 SV102 of Guided Reporting. We had to switch to it when we moved to the v8 platform. Beware however; if you use nested parameters in GR you will need to come up with a workaround. They are no longer supported in PV600.