some them you can some can not

if theme can not look the original image in the theme folder and change to what you like 

clear cache then your new image will show

I changed that header from backend day before yesterday and now the possibility to select has disappeared.

NEW ERROR IS LOG: 

[Fri Nov 27 11:40:00 2015] [ow_core_log] [Notice] Message: Undefined variable: uid File: /srv/disk1/1746522/www/colossus.fi/ow/ow_system_plugins/base/classes/attachment.php Line:59

[Fri Nov 27 11:40:00 2015] [ow_core_log] [Notice] Message: Array to string conversion File: /srv/disk1/1746522/www/colossus.fi/ow/ow_smarty/template_c/db8e73623085d5ecdded39cefedd4c2bdeffd6ed.file.feed_item.html.php Line:73

  

revert your changes then

I simply changed the image in static header, no problem, but I feel there's something wrong with in there. Just can't put my finger on it.

revert your changes

and change the image not the code 

you change the code how in hell do u expect the theme admin to be able find it 

Change code...? What do you mean?

just revert your changes 

I changed the image file, not the code.

do i have to hit u in the head with a stick
revert ur freaking changes 
so the upload image in admin themes works then use 
upload image in the admin themes
then if that dont work post error here 

Actually, I understood just a minute a go and I did already just done that. 

For some reason, yesterday editing CSS (from backend!) did not have any effect. (No, really! Even using different browser and clearing cache.) Only way I can change header now is using already uploaded image in CSS, but it's ok.

I deleted ow_themes/simplicity folder contents via FTP, dowloaded brand new Oxwall 1.8 and uploaded original content to simplicity folder.  The site looks ok now, but:

# 2. Header image uploader is still missing.

Sorry.

clear cache and revert you css changes and anything else you have done 

I restored yesterday's earlier database and now problem is gone. 

Thank You.

Kimmo, do you mean after restoring the database, now you can change the header without an issue?Keep us updated. 

Yes, I can change header image from theme customisation, these theme-related problems seem to be solved now.

Ok, thanks for letting us know.