Hi. I am having problem also with my libary on High Sierra.
I have been using Endnote x7 for 2-3 years with the same libary file. It seems since I updated Mac software, the file will not open. I do not get any error messages. What happens when I double ckick is Endnote opens, but opens a different file (the default I think) - ‘my libarary’ this is not the name of the file I want to open.
If I go to file open, again, it allows me to click on it, but nothing happens, no error, no timer, no ‘indexing pdfs’ etc. I have tried to use the inbuilt recovery function - then when I try and open that file I get indexing pdfs and after 3/400 (out of 3500+) I get error message and programme closes.
Interesting, the file does open on my friends computer - so I do not think the file is corrupt. He has not updated Mac software and has updated to EndNote x8. I have updated to x8 with no change.
I need help!