I am fairly sure. I worked on a couple of projects with a 2 Cognos developers (each had over 10 years of experience with Cognos) and we had to pretty much start from scratch when we migrated the clients to Cognos 8. I have even heard rumors that Analysis Studio may be replaced with PowerPlay...
Unfortunately, there is no migration of cube reports to Cognos 8. This is always a major issue when dealing with clients upgrading from a previous version. The main reason is that Cognos 8 has a new tool called Analysis Studio which replaces PowerPlay web.
Don't know if this helps with the 'home base' idea but you can press the New button on the toolbar to open the cube with the default analysis showing but it will prompt to see if you want to save.
Something to try...Disable the filter for the date and see if other drill through points work.
Although, I think your problem is related to the bug I had, another colleague was having an issue using dates in Oracle and completely rebuilt the time dimension in the cube and that solved his problem.
I also had some that worked and some that didn't. There was no pattern (or at least none I could figure out). Also, I had to push the issue very hard with Cognos and it took over a week before they agreed there was a problem. I don't know how many times I asked about a hotsite fix before I...
I had the exact same issue and I had to contact Cognos Support. There are some issues with the in_range filter. I was given a hot site fix that resolved the problem. I would suggest contacting Cognos Support.
Cheers,
PT
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