TWS 949.3. Noticed starting on March 4 that, in a chart, once I narrow a bar thickness (from 3 pixels to 1), I can no longer widen it again (the View->Bar Thickness->Increase Bar Width button is greyed out). Even if I close the chart and create a new one with the same time scale. But if I create a chart using another time scale, I'm back with a 3-pixel width... until I narrow the bar again, and then I can't widen it.
From comparing the settings file before and after, it looks like under <ChartWindowConfig> there is a <BarInflateMap>. If I narrow the bar width in a 9hrs/1min chart, then <Entry key="5:9 hours" val="0"> gets added under <BarInflateMap>. val="0" seems to mean "user can't widen bars here"; the handful of other Entry elements there have either val="0" (for my typical 1day/1min chart) or val="1". If I change val="0" to val="1" and restore settings, the 3-pixel-wide bars reappear.