The hugely delayed Washington Convention Center Hotel deal, which in July appeared to be back on track thanks to a city-brokered public financing deal with developers, is once again in trouble. Developer JBG Cos. is suing to stall the start of construction, claiming that the contracting process that gave a 99-year lease to Marriott was not up to snuff, the Washington Business Journal is reporting. The lawsuit could very well mean that the sale of bonds for the project could be delayed, which would in turn push back ground breaking on the project. The city’s only hope to keep things on track will be if a judge agrees to toss out the case in short order, as construction has been slated to begin this fall.