After installing this plugin it built the sitemap ok. After that sometimes it will rebuild and sometimes it won't. When it doesn't it gives the following message:
# The last run didn't finish! Maybe you can raise the memory or time limit for PHP scripts. Learn more
# The last known memory usage of the script was 14.75MB, the limit of your server is 100M.
# The last known execution time of the script was 1.03 seconds, the limit of your server is 120 seconds.
# The script stopped around post number 11 (+/- 100)
As you can see, it can't be the memory or time limit, it's a new site so does not exactly have much content at the moment, plus if it was due to the memory or time then why does it work sometimes?
However, I did try increasing memory and time, but it didn't make any difference.
When I click rebuild manually more often than not after a short time I end up at a blank page and have to return to the admin area, where I see the above error message.