Hello everyone!
You may be familiar with this one, as it has been going on for some time now. When you open up a Navigation List, click to preview a record in the list, the Preview Pane will show HTML code instead of the properly formatted data you would expect to see. The only known "workaround" we had was to rename the Dynamics.EXE.config file. This would cause any DLL-dependent features (Workflow 2.0, Document Attach, etc.) to stop working, so we don't recommend doing this anymore.
We could not recreate this issue accurately enough internally to get a good fix in place, and the fix kept getting pushed back due to testing difficulties. However, this IS currently slated for a GP 2015 "R2" release, as we have been able to reproduce and resolve internally.
If you have an add-in installed to GP, which is indicated by the presence of a DLL in the "Addins" folder, then this issue will not occur anymore.
Dan Peltier
GP Systems Support Engineer