Because the issue isn't integrated yet see : http://www.talendforge.org/bugs/view.php?id=7623
I don't know the timeframe.
You can apply the change made there : http://talendforge.org/trac/tos/changeset/25858
to your TOS installation in folder plugins/org.talend.designer.components.localprovider_3.1.x.rxxxxx/components/
Morbo, I think your advice is good to solve the problem, but that might be "dangerous" since teh bug telated to the commit that you point is not yet closed.
Take care :
The 7263 related to this issue has not yet been validated.
More over the patch link sent by Morbo is related to the trunk (i.e next 3.2) and might not be applied to branch 3.1
Open a ticket on our support application, you will receive an official patch as soon as available from the support.