It sounds like the lib might have been corrupted or that another non related lib with the same name etc may be confusing things.
If its a library you uploaded then you could delete it and upload the original to see if that fixes it or maybe try it on the desktop IDE.
Could you share the link to your CREATE sketch please so that somebody might try it themselves to see what you are facing an also a link to the original lib source too.
While you certainly do need to spell and capitalize the file name correctly (as you have failed to do here), there seems to be something wrong with Arduino Web Editor.
Added the requisite lib from lib manager.
On calling up one of the examples I just get a "loading source" message.
There are a lot of 404 errors in the chrome console which would indicate a server problem.
Unlike the forum I don't think it has a self restart fallback.
Would you like to throw it up on GIT (I tend to make a hash of it)
I will put it on SLACK.
EDIT
Same with other sketches that have a lib dependency regardless of lib source they are failing here.
ballscrewbob:
Would you like to throw it up on GIT (I tend to make a hash of it)
I will do so. I don't really like reporting issues there. Partly because I never use Arduino Web Editor so I'm not sure if I'm doing something wrong. Also because it's not very appropriate to issues not specific to the Create Agent. I've never been able to get a definitive answer from the developers on where the issues should be reported. They do a good job of responding to posts here but the forum doesn't seem well suited to tracking bugs. I remember being told that there is a private issue tracker for Arduino Web Editor. I'm surprised you don't have access to that one ballscrewbob.