PI DataLink: Cannot Insert Trend

There's this feature in PI DataLink where you can insert a PI Trend:




It's a weird feature.  As in... if you wanted to see a trend, why not use PI ProcessBook?

See the PI ProcessBook Best Practices For BioPharma.

Whatever the case, if you click that link and nothing happens, then you have a problem with your PI DataLink.

It's a symptom whose disease is solved by deleting either of these two folders in order to fix the problem:

• For Windows XP:

  C:\Documents and Settings\%USERNAME%\Application Data\Microsoft\Forms

• For Windows Vista, Windows 7:

  C:\Users\%USERNAME%\AppData\Roaming\Microsoft\Forms

It's actually the same exact root cause as those Compile error in hidden module: modAddin errors.