I selected "Download All for Offline Translation" for one of the languages in a project version page, but the progress bar never got past file 0 of 33. As far as I can tell, no server error was logged.
I tried it again, and it immediately jumped to file 1 of 33 and logged this error: WELD-000019 Error destroying an instance org.zanata.action.ProjectIterationZipFileAction$Proxy$_$$_WeldSubclass@3579fa5f of Managed Bean [class org.zanata.action.ProjectIterationZipFileAction] with qualifiers [@Default @Any @Named]
It doesn't look like it's going to get past file 1 of 33 this time.
I don't know if it matters, but this was a File project.