Version 1.0.3 is available for download.
This update fixes a couple of related issues with concurrent tasks in the Export dialog - "attempt to yield across metamethod/C-call boundary" and "We can only wait from within a task" errors that would force the user to re-load the plug-in or restart Lightroom.
To review the change log and download the latest version, visit the Dropbox Plug-in page.
NOTE: The plug-in is currently in Beta Testing. Please submit your feedback and bug reports to alloyphoto @ alloyphoto.com