Aviva's platform is still struggling to produce client reports, nearly a week after the company said the problem would be resolved.
The company had previously told FTAdviser it anticipated the problem would be resolved by the end of last week.
But advisers are still reporting that the issue has not been addressed and they are unable to produce client reports.
Chris Durant, a financial adviser with The Medical Partnership, said: "It is a disgrace. We are coming to the end of the tax year and I am seeing another two high net-worth clients on Monday night and I would be very surprised if I had reports to give them.
"Their apologies don't help me or my clients. We are actively looking for another platform to see if there's something out there that's better and competitively priced."
The platform was unavailable for six days beginning on the evening of 17 January as it moved to FNZ, its new technology provider.
But just one day after it came back online after the upgrade, investment advisers found they and their clients were locked out of the platform.
On top of the issue with client reports, Mr Durant said some of his clients had not received money from phased drawdown for several weeks.
FTAdviser reported earlier this week that advisers have said they are missing out on income because of Aviva's faulty platform, since they are not getting their adviser charges.
A spokesman for Aviva said: "We are continuing to work to make client reporting available as quickly as possible. We continue to keep the Whiteboard updated, so advisers can see when we are expecting these to be available.
"As we are giving expected dates, it is possible there will be some change in specific items.
"Our planned timetable for making drawdown payments, and payments to advisers, is still on schedule, as we previously outlined."