There's the idiom sitting on the fence (sometimes said as straddling the fence).
This idiom is often used to describe someone who is having trouble taking sides in a controversial issue, but it can also refer to someone who is simply having trouble making a decision about something.
Which laptop are you going to get?
I don't know - I'm sitting on the fence.
Phrase Finder defines it as:
sit on the fence (Figurative) not to take sides in a dispute; not to make a clear choice between two possibilities; to delay making a decision when you have to choose between two sides in an argument or a competition. (Origin: the image of someone straddling a fence, representing indecision.)
You can read a few examples usages at this website. Sometimes the expression is used negatively, though. Wikipedia mentions:
"Sitting on the fence" is a common idiom used in English to describe one's neutrality, hesitance to choose between two sides in an argument or a competition, or inability to decide due to lack of courage. This is done either in order to remain on good terms with both sides, or due to apathy to the situation and not wanting to choose a position they don't actually agree with.
Another word you could use instead is undecided, or torn:
Which laptop are you going to get?
I don't know - I'm torn.
Collins defines this word as:
torn (adj.) divided or undecided, as in preference ⇒ he was torn between staying and leaving
The word torn implies a reluctance to choose because there are aspects of both possibilities that are equally appealing (or unappealing).
Personally, I don't think using 'problems that flourish' is actually bad here. I would actually use it in non-work writing. But she is correct that it is a positive word.
Maybe you can use 'proliferate': which means to increase quickly and is more negative.
If you can include more of the sentence I can tell you if that would fit well..
Best Answer
Imminent does not have a positive or negative connotation, in my experience. It simply means that something is about to happen. So imminent impact is appropriate if you mean to say that the impact will happen within a short time, regardless of whether the impact will be positive or negative.