Hi aurfalien,
Could I ask how you concluded that case-sensitivity was the problem? We usually test VMware Fusion on case-sensitive (HFSX) and case-insenstive (HFS+) local volumes, so while it's possible that something has regressed and made us case-sensitive, it's generally expected to work. Can you provide more information on the filesystem(s) in use? (Local/remote, filesystem type/options, server type/protocol, etc...)
Fusion 5 includes 18 months of email support. If you're logged into My VMware using the account to which an in-support-period serial number is registered, you should be able to file a support request there in My VMware without having to buy any additional support. If that still doesn't work for you, I can (and do) file internal bug reports when given enough information or steps to reproduce the problem. 
Cheers,
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Darius