Share your thoughts on visual calculations (preview)

I found an error / bug, I tested the visual calculation feature on a matrix but removed it when I saw conditional formatting wasn't yet available. However, when my end-users tried to export data from that matrix they recieved an error: "exporting data is disabled because it contains a visual calculation or hidden field." This happening despite the fact that the matrix did not currently contain visual calculations nor hidden fields. I had to rebuild the matrix from scratch and re-publish the report to correct the issue, so it seems like using Visual Calculations infects/contaminates whatever visual you drop them on in a way that lingers after removing the Visual Calculation.