Edit function not working

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Hello. I have just installed Concrete5 Version 5.7.5.9 via the Softaculous Apps available via my web hosting cpanel. I've read through and watched the Getting Started videos regarding editing the Elemental theme by clicking on the pencil icon at the top of the page and the hovering over or clicking the section I would like to edit. But nothing seems to be editable. I am in the Edit mode - I have checked and double checked this and tried clicking out and then back in, but none of the areas seem to be editable.
Interestingly, when I click on the Page Settings, I can see an error message underneath the available options which tells me that it was Unable to load Dynamic Library plus lots of other coding which unfortunately I cannot copy and paste here as it isn't selectable, so I've attached a screen shot instead.
What am I doing wrong?

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Gondwana replied on at Permalink Reply
Gondwana
I think that error indicates that your server's php installation doesn't fully meet concrete5's requirements. Some details of required packages are at
http://documentation.concrete5.org/developers/installation/system-r...

There may be some clues about what's missing in your Dashboard, System and Settings, Environment Information.

You could also check Dashboard, Reports, Logs.

You may need the assistance of your web host to install the missing packages, although it might be possible to do it via CPanel.

There's a chance that changing php version might do the trick (although it shouldn't).
karenwride replied on at Permalink Reply
Hi, Thanks for your reply.

I have contacted my server and asked them to look at what the requirements Concrete5 needs as you suggested, but they came back with this response:

"It appears to be looking for ffmpeg, but that is not listed as a requirement on that page. Everything else should be fine in terms of the requirements. Can you ask about the ffmpeg requirement?"

Could you tell me/my server what is needed?

Thanks
mnakalay replied on at Permalink Reply
mnakalay
ffmpeg is a video compressor. That's really weird. I don't see Concrete5 needing that.

Actually, now that I am looking a little more at the error messages, they are not C5 messages, they are PHP related messages. It seems PHP is having problems loading the FFMPEG extension.

So unless you need it, I suggest you ask your server manager to deactivate the FFMPEG extension.

I read somewhere that there was a bug in an older version of PHP (5.3.2 I think) with FFMPEG but I don't know if that's the case here.
Gondwana replied on at Permalink Reply
Gondwana
I just did a fresh installation and got the same ffmpeg error. Stranger still was that CPanel reported that ffmpeg was installed for php. I changed php version from 5.5 to 5.6 and the problem went away. Maybe there's something dodgy about php 5.5 installations ATM (bad modules disabled due to exploits?).