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The KH2 gummi mission has been fixed since r373, but r373 and onward adds smbauth method which breaks wifi connectivity (at least that what I think it breaks as it wont read my laptop drive).
What I did was simply copy the changes made in 373 in the file loader/patches.c to stable relesase v0.7 and recompile.
If it's allowed, I will upload the patches.c file here.
No that won't help in that case (I mean, merging changes back to the "old" version 0.7 doesn't make sense).
What we must find, is if SMB auth does really break something.
In fact, you are not forced to used auth in later revision. You can still use guest and provide empty password.
We need a more precise description of your setup, your OPL network settings, and a wireshark capture would be useful.