There are two cases. For both use the following text in the control: "The quick brown fox jumped over the lazy dog." Case 1 [1] *No text selected* [2] Left click just before the letter "b" in brown (no selection visible) [3] Still holding left click, drag mouse to just after "x" in fox (no selection visible) [4] Release left mouse button ("brown fox" is visibly selected with a blue highlight) (if it does not occur, then click and hold down the left mouse button in front of the "o" and mark till the end of the line - "over the lazy" -> Selection will not appear until the mouse button is released Case 2 [1] *No text selected* [2] Left click just before the letter "b" in brown (no selection visible) ** The remaining steps require you to continue hold the left mouse button down ** [3] Drag mouse to just after "x" in fox (no selection visible) [4] Drag mouse outside the bounds of the control such that the cursor is directly right of the first line of text ("brown fox" will be visibly selected as soon as the mouse leaves the control bounds) [5] Drag mouse up and down between first and second lines of text while remaining directly to the right of those lines and outside control bounds (selection highlight will be changing between "brown fox" and "brown fox jumped over the lazy") [6] Drag mouse between first and second lines of text while within the bounds of the control (visible selection updates either very slowly or not at all, sporadic and unpredictable)