Elias, these are due to the changes I made the other day.
1) This is actually a fix to an irregular behavior. The text inside a spoiler should be treated as a separate body of text, with a separate scope for alignment and other stylistic changes. This means that the following code
Code:
[align=center][hide=test]test hide[/hide] more test[/align]
is rendered as
[hide=test]test hide[/hide] more test
As you can see, the spoiler header and the "more test" are centered, but the text inside the spoiler is not. If you want that to be centered too, you should use the following code:
Code:
[align=center][hide=test][align=center]test hide[/align][/hide] more test[/align]
which is rendered as
[hide=test][align=center]test hide
[/hide] more test[/align]
2) This is because, when the spoiler expands, it needs to create a new block of text that takes up all of the width of the post. In the past, this was the reason why the spoiler was automatically inserting a line even when in collapsed mode. This meant that you could not have two spoilers next to each other in collapsed mode. However, when you expand them, the new line is inserted, and show you see the behavior you reported.