Tortoisesvn skips recording mergeinfo
Well, this was awkward. If you do the merge and the URL to merge from has a different base URL than your working copy's checkout URL, the merge will perform, but no mergeinfo is recorded.
The difference in the URL string was a capital letter(!). So this means that the URL to merge from must be exactly equal to your trunk, also the casing of letters.
This must be a bug in tortoiseSVN?
Example: Checked out trunk from http://****/svn/repo/trunk Try to merge from url http://****/svn/Repo/branches/****
This will do the merge, but not record mergeinfo