Opening an MXD in ArcMap causes the Graphics tab to go blank.
This issue is likely related to the following bug resolved in ArcFM 10.1.
MM46168: Graphics Tab -- Graphics tab goes blank when loading MXD in ArcMap.
The workaround is to open MXDs outside of ArcMap.
Graphics Tab Patch #7234 is available for ArcFM 10.0.2.