Iain, Michael,
I talked to the development engineers and filed a production stop bug to address the redrawing problem under the number SDSCM00047525 (check its status in the link SDOWP in my signature below). He will address this for CCSv5.5 and release a patch for v5.4. I confirmed this does not happen in v5.3.
Unfortunately graph repainting has been problematic for a while… And not easily fixable. We’re planning to completely redesign the graph in CCS6+ to address performance and usability.
Sorry about the inconvenience,
Rafael