Hello!
We used your Sitemap tool for years. Now I found out that the tool crawls and echos "Sitemap created", but the Sitemap file have NOT been updated.
We changed 2 things: https-only and our server.
I tried to change domain from https:// to http://
No effect
Changed CHMOD, no effect
Deleted the Sitemap files before crawl: No new files have been created
Changed directory for output: no effect
After pressing "Run" typically you see 
    Links depth
    Current page
    Pages scanned
    Pages left
    Time passed
    Time left (estimated) 
But not in my case. (I can see the details for part of a second)
And this is the result of the crawl:
Sitemap details
Created on:
6 July 2015, 13:49
Processing time:
0:00:02s
Pages indexed:
0
Download:
XML sitemap 
In text format 
In ROR format 
HTML sitemap 
Images sitemap
0 images
Mobile sitemap
0 pages
Please help.
Thank you,
David