did you apply the hotfix mentioned in the email from Technical Support? Hotfix 500-005 was created to address this issue and can be found on the Maple T.A. 5.0 Hotfixes webpage:
Applying the hotfix will not undo the damage done, but any course module imported subsequently will retain the question bank/topic/question structure.
Note that Maple T.A. Hotfixes must be applied sequentially, so you must install hotfixes 500-001 to 500-004 before applying this one. This hotfix is also included in the Maple T.A. 5.01 installer, so users upgrading from Maple T.A. 4 with this installer will find the question/topic structure preserved (implemented as question groups/subgroups).
If you missed the hotfixes when they were posted on the website then I would recommend signing up for the Maple T.A. Product Hotfixes mailing list:
That way you'll be notified by email whenever a new Maple T.A. hotfix is released. I hope this helps.
Manager, Technical Support & Quality Assurance