не одно, так другое

[ВладимирК]

в ситуации, когда с чем-то стало лучше, а с чем-то - наоборот

[Aiduza]

one man's meat is another man's poison
or, to be more politically correct: one person's meat is another person's poison.
or, to be 100% correct: one man's folly is another man's wife.
;-))

[nephew]

something lost, something found/won

[watchkeeper]

(it's) one thing after another
bad things keep happening

[ВладимирК]

Thanks a lot to all who replied!