Set message doesn't show

Are you able to provide a screenshot of the context and reaction? Do you see the message if you are logged in vs anonymous?

Could you also provide your PHP version? Thanks!

I'll assume that you have a valid context condition set. Can you provide the php version you're using?

Edit: Thanks. I'll be able to take a look at this soon! I'm thinking it may have something to do with some changes in 5.3 about the usage of pass-by-reference. If you have access to any error logs that would certainly help.

Switching this to active as it seems probably that there is a problem with using pass by reference. Will confirm asap.

Trying to reproduce this in php 5.3.6 with no luck.

Can you please add the following to context_set_message/plugins/context_set_message_reaction.inc and paste the results here:
after:
$message = isset($v->reactions[$this->plugin]['message']) ? $v->reactions[$this->plugin]['message'] : '';
add:
print_r($v->reactions[$this->plugin]);

... this will allow us to see if the plugin data is at least being loaded.

Thanks!

This doesn't seem to be a PHP issue. Could you please also post which versions of context and Drupal core you're using? Thanks again!

Side note: vanilla install with the following modules on PHP 5.3.6 works as intended:

 Drupal version         :  7.14 
 Context             Context (context)                                Module  Enabled        7.x-3.0-beta3    
 Context             Context Set Message (context_set_message)        Module  Enabled        7.x-1.0-alpha2 
 Context             Context UI (context_ui)                          Module  Enabled        7.x-3.0-beta3
 Other               Token (token)                                    Module  Enabled        7.x-1.1    

Definitely appreciate your coming back here and posting details. I've downgraded my version of Token to match yours but the plugin is still working for me. Could you see if adding
print_r($this->get_contexts());
directly after the
function execute() {
line in context_set_message/plugins/context_set_message_reaction.inc? This should print out all of your applied contexts, and ideally should look something like this:

Array
(
    [test] => stdClass Object
        (
            [name] => test
            [description] => 
            [tag] => 
            [conditions] => Array
                (
                    [path] => Array
                        (
                            [values] => Array
                                (
                                    [<front>] => <front>
                                )

                        )

                )

            [reactions] => Array
                (
                    [set_message] => Array
                        (
                            [severity] => status
                            [message] => testing
                            [message_extra] => Array
                                (
                                    [hide_empty] => 1
                                )

                        )

                )

            [condition_mode] => 0
            [table] => context
            [type] => Normal
            [export_type] => 1
        )

)

If nothing prints here, it would lead me to believe that the plugin itself isn't being loaded. This may be a silly question, but have you tried clearing caches?

Thanks again!

This is really strange. That means that no context reaction is occurring. Can you add a block with the same reaction and see if the same still prints? I've tried this on several environments now and am still unable to reproduce.

Do any other reactions break when this happens? Does the theme condition do anything that would hide a message from being displayed? Can you please paste the output of print_r($this->get_contexts()) as mentioned above both before and after you have the theme condition enabled? Thanks so much! I will try to recreate this ASAP.

Found the issue here. Patch in the works. Thanks for all your reporting!

Fixed in alpha3. Thanks again!