Impossible to move/remove blocks, once they're assigned to a region

Interesting. What browser and OS are you using?

Sub. I'm having the same problem using Firefox 3.6.3 and Chrome 5.0.375.23 under Windows. My version of Context is 6.x-2.0-rc1.

Changing to actively maintained version.

Is there anything in your JS console or any other visible errors?

None that I can see. I had Javascript errors and warnings turned on with Firebug.

What themes are you using with context when you got the errors?

Sorry for the long delay on this response. I was using genesis theme and it has a known conflict with context. #763790: Unable to view Context.module's block delete link with Genesis Subtheme

I had the allmost the same problem. An uncaughed error in the js while the page was loading, and when trying to remove a block. After debuging i found this in "context_reaction_block.js" :

// Show blocks in selector that are unused
$('div.context-blockform-selector input').each(function() {
var bid = $(this).val();
if ($('table.context-blockform-region tr#'+bid).size() === 0) {
$(this).parents('div.form-item').eq(0).show();
}
});

$(this).val() was empty ! It makes jquery bugging on the call : $('table.context-blockform-region tr#'+bid).size()

I added the commented line : if (bid == '') return;

// Show blocks in selector that are unused
$('div.context-blockform-selector input').each(function() {
var bid = $(this).val();
if (bid == '') return; //We check bid. If empty we just return.
if ($('table.context-blockform-region tr#'+bid).size() === 0) {
$(this).parents('div.form-item').eq(0).show();
}
});

And now it works without- error.

May-be it can help some one.
I hope it will be integrated in the module core ?

As far as I can tell, the maintainer got an answer

In patch form