Contribute 4.1 misunderstands Roller blog url

I'm using Roller 4.0. and i cannot view/edit because Contribute 4.1 misunderstands my blog url as relative path.
Connection setting is like:
http://example.com/blog/roller-services/xmlrpc
with user name 'someone'.

Contribute should recognize blog url like 'http://example.com/blog/someone'. but it was recognized as '/someone'.
In this result, Contribute misunderstands blog url like 'file:/someone' and cannot operate any operations, e.g. new entry, edit post, view entry..

Any additional settings or special patches are required?

Any pointers are appreciated.
Thanks,