danny la rouge
More like *fanny* la rouge!
Did you have all the strings off at once? The obvious thing is that you knocked the bridge wheels when you cleaned the guitar after taking the strings off. (If you didn’t clean the guitar you’re a manky fucker).I got new strings for my SG and now the D string is buzzing when played open, I dunno what I've done or how to sort it. Got 11-48s rather than 10-46 as previous. Any ideas? Have tried adjusting the bridge but I think the problem is the nut end
Another possibility is you put the bridge back on back to front. Or even just the D saddle.
And yes, I have done all these things at one time or another.