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Since the questions closed by admin remains in the question list, clicking n viewing them  just gives a blank page.

Anyone else seeing this?
Q2A version: 1.5
Please post a link if possible.
Sent you a private msg.
Here is the error message in apache log:

PHP Fatal error:  Cannot unset string offsets in /qa-include/qa-app-format.php(1453) : eval()'d code on line 91, referer: xxxx

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Based on your final comment, this is an issue with a layer in one of your plugins. The full error message may give a hint about which plugin it is.
I'm not sure what you mean by "full error message". Whatever shows up in apache error log after I clicked the question is copied to above, minus any site-specific details.

I'm using a number of plugins available in your site. Yeah, some of them are claimed to be v0.x.

Is there somewhere that I can turn on this "full error" function? I want to get to the bottom of this issue.

OK, so it sounds like the full error message wouldn't help.

You'll need to experiment with disabling plugins (remove them temporarily from the qa-plugin directory) to find out which is causing the problem. You can also narrow it down ahead of time to a plugin which makes some change the question page.