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"this problem started" is correct and usable in written English.
You can use it to begin a sentence when describing a scenario that presents a problem. For example: "This problem started when we noticed the car was making an odd noise."
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We're not sure when this problem started occurring, but Twitter app developer Mallikarjun Reddy noticed it earlier today and adds that it is not an issue on Bit.ly's side since its API for URL expansion seems to work just fine.
This problem started long before Twitter.
When people analyze the situation, there will be -- this problem started before my presidency, it obviously took place during my presidency.
This problem started because I used to smoke " sigara kubwa " (the big cigarette, a local name for cannabis ).
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How did this problem start?
The Plan document outlines a comprehensive strategy for dealing with this problem, starting with a serious effort to map available ground water supplies aquifer by aquifer.
During that time I thought how one might approach this problem starting with a completely clean slate.
Other players will not take the development of Force.com sitting down, and they are going to attack this problem starting from other directions.
For this reason, alternatives have been proposed to solve this problem, starting from anonymization and heuristic operational measures which do not provide formal privacy guarantees.
In companies this problem starts at the top, with the CEO and how the CEO relates to his or her direct reports, and it cascades on down through the organization.
Below we present another approach to this problem starting with the following question: how can one conclude about positivity of Green's function in the cases when the spectral radius satisfies the opposite inequality or Green's function changes its sign?
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com