I have just tried a new instalation of JoomlaStats on two sites and both give me the same problem.
I have installed the basic System- Content Statistics plugin and the set of modules.
Instalation went without error.
I enabled the plugin without issue, it shows as enabled.
My problem is with all the modules, THere is no options in the drop down "Content Provider" it is not that they are blank, there is no dropdown available, I just get option -Select a content provider"
Since this seems wrong I am trying this post before starting debug.
All software was taken off the 1.5 section of the site today.
mod_content_statistics_1.3.0_pro
mod_content_statistics_compare_1.3.1_pro
mod_content_statistics_individual_1.3.2_pro
plg_contentstats_1.3.1

I also tried adding a couple of other specific plugin's but none appeared to select in the module.

I have waited, re-load and even re-installed all to no effect.

Any help appreciated.