AutoCAD Inventor :: Parameters Inserted Into Drawing Text Keep Disappearing

I am running into some trouble with user parameters that have been inserted into a dimension's "text box". I sometimes hide the dimension itself and insert these parameters so that iLogic can manipulate the upper & lower tolerance limits for a dimension.

The problem seems to arrise anytime one of the dimension's arrows becomes detached from the drawing (and perhaps for other reasons, too, although this is the only clear cause so far). I can reattach the arrow and the dimension seems healthy again, but if I go into the text editor, I notice that the link to any parameters that I've inserted has been lost. They appear as they were last set, but will not update if the parameters themselves change.

Is there a better workaround for this, or can we expect a solution in IV2013? I've invested close to a year's worth of work expecting this method to perform properly, and it will be a letdown if there's no solution.