Using a newly installed Font in Composer can give the error "Only TrueType fonts are supported. This is not a TrueType font" and cause Composer to crash.
(1) Change your DPI setting to large (2) Drag down using the dots the list in the mashup explorer part of Composer i.e. minimize down the list so none visible. You can now never get it back without switching your dpi settings to normal.
In composer edit a transtion and select show new note field in options tab. Create a custom quick form for the transition and Deploy the mashup. Login to browser and execute the transition.
Chapter 2: Mashup Composer Interface Element Description Font Specify the name and size of the font used in the Javascript editor and Script editor, and in the Content tab of some form widgets (for example, the HTML/JavaScript and Google Gadget widgets).