Some Fidelity Investments customers were in for a nightmare scenario on Wednesday: when they logged into their online portals, they saw they had no balance — or, in some cases, no account at all.

The Boston-based financial services company is fielding complaints on Twitter from users who say they can’t see their retirement accounts, or their other investment or checking accounts. The problem appears to have started in the morning, though the company was still responding to Twitter users as of 3 p.m. EST.