Gmisc: lineGrob problem

I am trying to draw a Markov diagram. The code below works fine up to the last (commented out) line.

Tp <- boxGrob(glue("State 1:  Tp",
                   "  ",
                   "Entered:    72 (IA: 48, IAK: 24)",
                   "Censored:   8 (IA:   7, IAK:   1)",
                   "Failed:       11 (IA:   4, IAK:   7)",
                   "To II:          53 (IA: 37, IAK: 16)",
                   .sep = "\n"), 
              txt_gp = gpar(fontsize = 11), 
              width = .4, height = .4, y = 0.8, x = 0.2)
II <- boxGrob(glue("State 2:  II",
                   "  ",
                   "Entered:      53 (IA: 37, IAK: 16)",
                   "Censored:   30 (IA: 20, IAK: 10)",
                   "Failed:           0 (IA:   0, IAK:   0)",
                   "To LostII:     23 (IA: 17, IAK:    6)",
                   .sep = "\n"), 
                txt_gp = gpar(fontsize = 11), width = .4, height = .4,
                y = 0.8, x = 0.8)
LostII <- boxGrob(glue("State 3:  LostII",
                   "  ",
                   "Entered:    23 (IA:  17, IAK:  6)",
                   "Censored:  18 (IA:  14, IAK:  4)",
                   "Failed:         5 (IA:   3, IAK:   2)",
                   "To Failed:     5 (IA:   3, IAK:   2)",
                    .sep = "\n"),  
                txt_gp = gpar(fontsize = 11), width = .4, height = .4,
                y = 0.2, x = 0.8)
Failed <- boxGrob(glue("State 4:  Failed",
                   "  ",
                   "Entered:        16 (IA: 7, IAK: 9)",
                   "Failed:           16 (IA: 7, IAK: 9)",
                    .sep = "\n"), 
                txt_gp = gpar(fontsize = 11), width = .4, height = .4,
                y = 0.2, x = 0.2)
Tp; II; LostII; Failed

connectGrob(Tp, II, type = 'horizontal')
connectGrob(II, LostII, type = 'vertical')
connectGrob(LostII, Failed, type = 'horizontal')
connectGrob(Tp, Failed, type = 'vertical')
#linesGrob(x=unit(c(0.8, 0.8), 'npc'), y = unit(c(0.6, 0.6), 'npc'),
 #        default.units - "npc", gp=gpar(), vp = NULL)

GraphAppPrintJob.pdf (6.6 KB)

I now need to add an arrow from the lower left corner of the top right box to the upper right corner of the lower left box. The commented out last two lines should do this, but it isn't working. What am I doing wrong? Any alternative way to draw this arrow?
Thanks in advance for any help/suggestions.
Larry Hunsicker