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Some Wordpress plugins that help users make their websites more secure or load faster, might cause issues with ProveSource.
This happens due to the nature of those plugins:
blocking "unknown" or external software from sending/receiving data on your website.
caching your website and by that causing an old version of it to load, which does not have ProveSource code added.
The solution is quite simple:
If it's a cache plugin - after adding ProveSource you should refresh or clear the cache.
If it's a security plugin - you should whitelist or unblock ProveSource in the plugin's options.
Here's a (incomplete) list of plugins that are known to cause issues with other plugins: