Hi Michael,

My viewport navigation controls are:

• RMB = rotate Perspective viewport or pan orthographic viewport
• Control + RMB = zoom
• Shift + RMB = pan Perspective viewport

If I use either of those controls outside of the export dialog, the export dialog exits. Maybe the RMB cancels the export operation?

A positive note for now: I couldn't manage to recreate the selection drag lag. It might have been caused by MacOS having been active all day without restarting, causing fragmented (video) RAM and such fuzzy causes. I'll let you know if I encounter it again.