getting error abort: ':' cannot be used in a name

Issue #2291 resolved
created an issue

When I used older version of Tortoise HG it allowed me to use the character ':' in branch names.

Now our repository is quite large with lots of branch names containing the character ':'

I updated to the latest version of TortoiseHG (2.6) and now whenever I try to update the work space to the head of any branch that has the character ':' in the name this error occurs:

"abort: ':' cannot be used in a name"

not sure how to work around this, its preventing us from getting any code out of the repository.