:salam:
As some of you have noticed and pointed out, the spacebar doesn't always work properly when you are quoting a post. This is a known issue in the latest version of Chrome browser.
vBulletin does not have any plans to fix this issue and they say Google might fix it in the next browser update.
The workaround for this issue is to use the Standard Editor instead of the WYSIWYG editor. You can change the editor settings in your profile by going to your
user control panel ->
General Settings, then scroll down to find the settings for
Message Editor Interface and select the
Standard Editor.
Alternatively, you can also click on this button
while replying to posts. It is a short-cut method to switch to the standard editor temporarily.