Here are some examples of the issue with the crosshairs cursor remaining after certain commands, that I can replicate.
Please note that in the following examples in Rhinoceros/Preferences/Modeling Aids/Cursor ToolTips, Enable cursor tooltips is checked, and below it Osnap, Distance and Command prompt are also checked.
With these settings all the “Box” creation commands, like Solid/Box/Corner to Corner, Height display the crosshair cursor issue. No matter whether you input numbers or just drag the cursor to create the box. When the box is complete you see the crosshair cursor with a balloon below it that says “Height, Press Enter to use width” When I then press enter, the program wants to repeat the command to make another box. Only when I press “esc” does the curser revert to an arrow.
This also happens when creating any of the other Solids.
The same thing happens when for instance I do Solid/Extrude Surface/To Point (or any of the other three options). At the end of the command the balloon below the cross hair cursor will say “Point to extrude to, …” When I hit enter, the command repeats. When I hit “esc” the cursor changes to an arrow.
There are other commands with which this happens, I cannot remember all of them right now. I can also replicate this with Boolean Difference as well as Solid/Fillet Edge/All three options.
When I uncheck “Enable cursor tooltips” in Preferences/Modeling Aids/Cursor/ToolTips (including everything below it) or uncheck just “Command prompt” this crosshair cursor behavior does not happen. However, something else is different also. With the option(s) unchecked the cursor is never crosshairs, but always an arrow.
Please let me know if you can replicate this. If you can’t, I’ll make a movie and send it to you.