Hi, you should contact your host and ask them what apache modules are enabled.
Also, could you try dbseo (after completing the steps) and let us know if there are any issues with the following... check to make sure the rewrites are being done too please.
Forum urls
Thread urls
Tag urls
Member page urls
Can you browse to other pages from those forum sections listed above without error?
If it is the forum homepage only being affected, try removing the # in this line.
# Options -MultiViews
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