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Created attachment 746 [details] file to reproduce the problem Open the attached file. Click at the beginning of the 4th paragraph ("The solution ..."), and select the whole paragraph dragging the pointer to the end ("... system calls."). Then click on the "select a text color" button on the sidebar at the rigth. Select a color, like, e.g. blue (4th row, 5th column). Click "OK". At this point Amaya enters an endless loop. There is no way to recover, except by terminating it with the [X] button or the task manager (hoping it can then recover the editing).
It was not easy to reproduce that bug as it occurs only with a specific window width. The bug is now fixed and the fix will be available in Amaya 11.3 Thanks for the report.