I've found that when doing some account expense reports that some expenses are not found or the wrong expense is pulled from a grouped transaction. If I ungroup the transaction, the correct part of the group is then reported accurately.

Can you give more information? What is the name of the report you are using? Have you ran the 'File > Tools > Check Data' tool?

For instance, I'm doing an account statement for materials bought for a client. If I purchase multiple items for multiple clients at one time, I use the group function to collect them together in one transaction. I've noticed that an account expense report for a unique project may list another project name that has been grouped with it. It seems to be the last project listed in the group that is reported. The money value is passed correctly but the project name is a problem. I use this statement to do client billing and having that incorrect information causes problems.

Are you able to create a new file only with a few transactions to show the problem? That would be great to reproduce it here! If so you can attach it to a Support Ticket. You may have to compress it first since attachments are limited to 1 Mb.