I have submitted my manuscript (computer science field) to an Elsevier-published journal. It has been "with editor" for a month (after getting the manuscript number). Two weeks after submission I had mailed the journal manager to get an update about any developments. The manager acknowledged that it was unusual to remain in the "with editor" status for so long (two weeks) and said he had written a mail to the handling editor to take quick action and invite reviewers for my paper. Two weeks elapsed after this (total one month after submission), and the status still remained "with editor".
I mailed again requesting for an update. The reply again acknowledged that this situation is unusual. The journal manager notified the situation to handling editor and editor in chief, and assured that quick action will be taken.
Four days have passed since then, things remain the same.
The journal manager talked of "unusual" and "quick action", but the handling editor appears to be not responding.
What is the opinion of this community on the situation, what may be the future course of action, is it a cause for concern ?