tomcat manager gui hangs on web-app reload for one web-app not others

[Bill Harrelson]

Tomcat 8.0.14, Java 1.8.0_91. I've looked through StackOverflow and 
searched the archives and can't figure this out. We've been running 
tomcat, various versions for about 15 years, always using the 
manager-gui to control hosts. We have one tomcat instance running 8 
hosts, where the manager-gui works fine for all but one of them. I've 
compared /conf/Catalina/WEBAPPname/manager.xml with others that are 
working and they are identical. I've compared the directory name with 
the name in server.xml and it's identical. Behavior - when I start the 
manager-gui for that web-app, it logs in and starts fine. I can see 
sessions, I can see Server Status, etc.  all seems to work, except: - 
if I click on Reload or Stop, it just sits and spins and eventually 
times out. Every other host manager gui gets an immediate tab name 
update, then completes, changing the url. This one web-app does none of 
that. When this happens there are no entries in the catalina log, the 
tomcat stderror log, or the web-app access log I can't figure out where 
to look next. Any help would be appreciated. Thanks. It's a test server 
and having to restart all of tomcat to change the test configuration is 
slowing work way down. Bill