Hi —
Wow… that is really a lot more links then we ever expected anyone to use!
I tried a test with with 671 links:
-the Import can go a little slow as the JavaScript has that large table to build but it works OK (you may get a script taking too long warning but you can just click Continue and it will continue until it finishes) (my 671 link test took about 60 seconds to import).
If you scroll to the very end of the table you should see the Import and Export feature after the end of the table, after the Save Changes button.
Perhaps there is a cache issue? You can do a hard refresh of the admin page by going to that page then doing ctrl-shift-F5.
Keyword to URL is for when you have lots the same link used many places. If your 650 links are a lot of single entries used just once then it would be much better to hard code those in their posts — I really can’t imagine anyone using it with 600+ links!
Let me know how it goes — also please let me know what browser and version you use. I did try it with 671 links on several Windows 8.1 machines and using Firefox 31, Chrome 37 and IE 11 as well as on Debian Linux using Ice Weasel browser — they all worked fine with 671 links imported from a .csv file.
Just to be sure you have the right version do you see this after the Save Changes button: Be sure to Save Changes before leaving this page.. That is new in 1.3 so if you see that I know for sure you have 1.3 (also you can verify that on you plugins page — it shows the version of each plugin.
Thanks ??