"problem stage" is correct and usable in written English.
You can use it to refer to a stage in a process or timeline where problems are encountered or need to be solved. For example, "We have now reached the problem stage in our project."
This situation has not yet reached the problem stage, but Mr. Elliott said that it soon would, with ever more people signing up for telephone service via the Internet.
It seems like what we're still dealing with is almost like a still in a social problem stage.
Stage 1: establishing the magnitude of the problem; Stage 2: identifying risk factors; Stage 3: developing effective interventions; Stage 4: ensuring widespread adoption and use.
20 When Mercy et al 3 first proposed the Public Health Model for injury prevention, they advocated a bottom-up approach that engaged practitioners, policy makers and the community in helping to define the problem (Stage 1), identifying causes (Stage 2) and developing and testing interventions (Stage 3).
2 3 In this four-stage model, research progresses in a stepwise manner from problem identification to adoption of effective interventions: 4 Stage 1: establishing the magnitude of the problem; Stage 2: identifying risk factors; Stage 3: developing effective interventions; Stage 4: ensuring widespread adoption and use.
After all, in LBP Sony had no problem staging a big black guy with fat lips in place of the famous ape in a level that seems to be a tribute to the arcade classic Donkey Kong.
The proposed methodology can be applied to real large-scale energy systems, like the Argentinean energy system, because the problem is conveniently decomposed according to the problem stages (typically months or weeks).
Almost all movies adhere to this man-with-a-problem template; the only exceptions are the films about women with problems (Chicago, Bridget Jones, Vera Drake), animals with problems (Jaws, Bambi), and cross-dressers with problems (Stage Beauty, Hedwig & The Angry Inch).
I wish the resort well, and I do sympathize with its possible problems staging the 2010 Winter Olympics if the weather during the Games turns rainy.
The authorities acknowledge problems staging polling in the steel mill and coal mine-dotted regions of Donetsk and Lugansk, where rebel leaders declared independent republics after hastily arranged referendums on 11 May.
About 2,000 employees of the computer giant logging on from home to dodge legal problems—staged a virtual protest against a new pay settlement at IBM's corporate campus in Second Life, an online virtual world.
