I am guessing Blizzard changed the action "Dialog - Create a label for dialog" in this patch.
I noticed that after this patch the Color value for this action was reset to default which is White. This would result in that the text always is locked to White even though you at some place in your code use "Dialog - Set Dialog Item Text" to some text with color values in it - ending up with a text that is always White.
This can easily be fixed by changing the Color value when creating the dialog item to "Automatic", that will make it work properly.
I am guessing Blizzard changed the action "Dialog - Create a label for dialog" in this patch.
I noticed that after this patch the Color value for this action was reset to default which is White. This would result in that the text always is locked to White even though you at some place in your code use "Dialog - Set Dialog Item Text" to some text with color values in it - ending up with a text that is always White.
This can easily be fixed by changing the Color value when creating the dialog item to "Automatic", that will make it work properly.
Have a look in my list here, if something doesn't work. There might have been found a fix for it already.