The software failure has since been resolved and RBS said service had been restored to 99% of its customers.
Jacques Cailloux from RBS said the taboo of a euro collapse has been broken, inflicting deep and lasting damage.
In a statement released on Wednesday morning, RBS said it was still in "late-stage settlement discussions" with US and UK authorities over "potential settlements".
Economists at RBS said the latter reading, the lowest since early April, was encouraging even if a chunk of the decline can be laid off on post-Hurricane Irene effects and seasonal factors.
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"We do, however, see the removal of implicit government support for the UK banking sector as being a necessary and important step forward as the sector returns to standalone strength, " RBS said in a statement.
Ross Walker of RBS, said the PMI brought forward the risk of a rate rise "sooner rather than later and brings February into play as a possibility".
William O'Donnell, head of U.S. Treasury strategy at RBS, said that foreign central banks have abruptly pared down the amount of Treasurys they are parking with the Fed for safe keeping in recent weeks.
The report shone a light on the poor relations between the FSA and RBS and said chief executive Fred Goodwin's "assertive and robust" management style was flagged as a potential risk as early as 2003, four years before the disastrous ABN Amro deal.
Speaking to Today presenter John Humphrys, Stephen Hester, chief executive of RBS, said that a "level playing field" is important for bankers' bonuses in the European Union and explained that his role is to "try to align RBS pay with things we want our people to do with customers and society as a whole".
He said RBS would carry out a detailed investigation of the problems and would publish the findings.
"Subdued actual export growth in April points to sluggish global demand, " said RBS economists Louis Kuijs and Tiffany Qiu in a report.
After completing an investigation which began in May 2009, the Financial Services Authority (FSA) said RBS had made "a series of bad decisions".
Writing to Prime Minister David Cameron and Deputy Prime Minister Nick Clegg, Mr Cable said RBS should be turned into a new "British business bank".
Insurance company Direct Line Group, which is being demerged by parent company RBS, has said it will shed 900 jobs in a bid to save costs.
"We now have support for a remuneration plan that ensures the majority of Stephen's reward is non cash and based on his performance, " said RBS chairman Sir Philip Hampton.
"Last year we lent considerably more than our natural market share to the tiddlers" said an RBS executive.
The smaller number of directors would be "better able to engage effectively in the restructuring process for RBS group", the bank said.
The bank's chief executive, Stephen Hester, said in January that RBS was ahead of schedule with the most complicated restructuring ever undertaken by a company.
Penny Hughes, chair of RBS's remuneration committee, said the committee had "spent a great deal of time challenging and taking action in response to past events and considering how remuneration can help to drive appropriate behaviours at RBS in future".
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Speaking about the future of the bank, Mr Hester said that the reprivatisation of RBS is "within reach".
However, it said the competence of any RBS individuals would be taken into account when making applications to any FSA-regulated firms.
He said he supported plans by RBS - which is 84% owned by the government - to shrink its investment bank into a business much more focused on UK companies.
That said, right now, RBS - like all banks - is finding it harder to borrow for longer periods, because (as you know) the eurozone's debt crisis has spooked creditors.
Amicus said it had been contacted by RBS staff unhappy about the requirement and urged the bank to reconsider its position.
"We just have a lot of legacy systems out there, " said Frances Coppola, a former RBS employee and an independent banking analyst.
Insurance firm Direct Line has said that its separation from parent group RBS is "substantially complete".
RBS, the bank's parent company, said the glitch had been resolved.
"No matter how much the yen weakens from the current level we are unlikely to see a sharp recovery in exports, " said Junko Nishioka, chief economist at RBS Securities in Japan.
"The market had concerns about the BOJ announcing any policy actions today, but the BOJ's decisions exceeded investor expectations, " said Junko Nishioka, Chief Economist at RBS Securities Japan, in a note.
"We all (would) like to see better growth in credit, banks being more willing to make more loans to consumers, demand for loans rising, " said Omair Sharif, an economist at RBS in Stamford, Connecticut.
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