You may see the behaviour where in, Task check box is greyed out and giving no option to select the task. Below is the screenshot.
This is the known issue and you may get this behaviour if you have changed the Site Theme to non default theme. You can verify the site theme using below steps.
1) Click on the Gear button on the Top right corner of the site.
2) Click on “Change the look”
3) Verify the current theme. If it is non default theme like “Green”, Orange, grey etc. then change it back to default theme “Office” and check if that helps to fix the issue.
The fix for this issue is included in http://support.microsoft.com/kb/2899508
If you need any additional information or support please contact us
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