There seems to be some differences in how the MacBook Air handles CD/DVD drives (as it does not have an internal one) compared to other MacBook models. Try making sure whatever state of CD/DVD drive you had when you suspended is still true when you resume, whether it was the external or remote CD/DVD.
If other words, if you suspended with an external DVD attached, and VMware was mapped to that hardware, hook it back up and resume.
Then, shut down the VM and change the setting to not be automatic, and not use a physical CD/DVD by default. You should be able to still map to a CD/DVD at will, just don't have it map to a non-existing one or the automatic setting by default.
I would expect the automatic setting to work under all circumstances on the MBA in the next release (1.1.2? 1.2?). I think what trips it up is the MBA reporting in some ways it has a DVD drive when it doesn't.