5.71: Loading a bracket while other data updates are happening may cause the export to lockup

[Wolfy76700]

When loading or refreshing a bracket in the bracket tab while other updates, such as a set update from the set monitoring system, is happening, the program may fail to export said bracket and completely block the export thread. This issue can also be caused from refreshing a bracket too many times in a short period of time. May be CPU and storage dependent as it was reported to be more frequent if the program was running from a USB flash memory stick.