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I find their support is excellent.
Do you have a full edition of Modelsim? If you can reproduce the issue with a smaller design and post it (or email it to me), I'll confirm it fails under a few different tool versions, and submit it under my mentor site ID.
Cheers,
Dave
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Ditto.
Ive reported several things that have been fixed.
Their issue tracking is much better than Altera's; they keep Enhancement requests and defect reports open until the issues are added or fixed. Altera just say "Thanks, we'll close this now".