Ok, you got a bunch of log entries, all with the same issue. Always something like that:
I thought you were using some plugin to manage fakse sessions but that's not the case. Then this is something related to IPS. The last log is from 11-07. If it happens again, I suggest you to submit a ticket.
Regarding my plugin, didn't find any entry in any log. The white page is a suppressed PHP error, which we can help to identify in order to know the cause. So, please, do this https://community.invisionpower.com/topic/421552-problems-during-install/?do=findComment&comment=2587559 and try to install again the plugin. It will show a message. Paste it here.