RStudio opens with a black screen

Hi,
Latest version of RStudio opens with a blalck screen, diagnostic info below. Any help would be appreciated.

[rsession-test] ERROR CLIENT EXCEPTION (rsession-test): (TypeError) : Cannot read property 'K' of null;
org/rstudio/studio/client/workbench/views/source/editors/text/AceEditor.java#4019::setScrollSpeed
org/rstudio/studio/client/workbench/views/source/editors/text/AceEditorMonitor.java#46::monitor
org/rstudio/studio/client/workbench/views/source/editors/text/AceEditorMonitor.java#70::execute
com/google/gwt/core/client/impl/SchedulerImpl.java#140::execute
com/google/gwt/core/client/impl/Impl.java#306::apply
com/google/gwt/core/client/impl/Impl.java#345::entry0
rstudio-0.js#-1::eval
com/google/gwt/cell/client/AbstractEditableCell.java#41::viewDataMap
Client-ID: 33e600bb-c1b1-46bf
User-Agent: Mozilla/5.0 (Windows NT 10.0 Win64 x64) AppleWebKit/537.36 (KHTML, like Gecko) QtWebEngine/5.12.8 Chrome/ Safari/537.36
27 Jan 2021 03:14:12 [rsession-test] ERROR CLIENT EXCEPTION (rsession-test): (TypeError) : Cannot read property 'K' of null;
org/rstudio/studio/client/workbench/views/source/editors/text/AceEditor.java#4019::setScrollSpeed
org/rstudio/studio/client/workbench/views/source/editors/text/AceEditorMonitor.java#46::monitor
org/rstudio/studio/client/workbench/views/source/editors/text/AceEditorMonitor.java#70::execute
com/google/gwt/core/client/impl/SchedulerImpl.java#140::execute
com/google/gwt/core/client/impl/Impl.java#306::apply
com/google/gwt/core/client/impl/Impl.java#345::entry0
rstudio-0.js#-1::eval
com/google/gwt/cell/client/AbstractEditableCell.java#41::viewDataMap
Client-ID: 33e600bb-c1b1-46bf
User-Agent: Mozilla/5.0 (Windows NT 10.0 Win64 x64) AppleWebKit/537.36 (KHTML, like Gecko) QtWebEngine/5.12.8 Chrome/ Safari/537.36