I sent an email earlier and received the following reply in less than an hour. It seems it only affects Demo accounts, which is a bit more understandable...
Dear Mr Parr,
Thanks for your email.
Our IT department has already been made aware of the missing candlestick dates on certain assets for our demo accounts.
The report number for this case is INC0584768.
Apologies for the inconveniece, please note that we are working towards solving this issue as soon as possible.
If you have any further queries, please do not hesitate to contact us.
Regards,
Renata R
Trading Services
IG